本文選題：雙螺桿　切入點(diǎn)：液力透平　出處：《江蘇大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：液力透平是一種能夠有效地將液體的動(dòng)能及壓能進(jìn)行回收的能量回收裝置。近幾年來(lái),隨著技術(shù)的發(fā)展和研究的不斷深入,液力透平逐漸在工業(yè)流程中得以應(yīng)用。一般來(lái)說(shuō),不同種類的液力透平都存在各自的應(yīng)用范圍,如單級(jí)泵反轉(zhuǎn)做透平只適用于低揚(yáng)程、中高流量工況,對(duì)于高水頭、小流量工況,目前還沒(méi)有一種技術(shù)成熟的液力透平能夠投入到長(zhǎng)期的使用中,因此迫切需要研究加以解決。雙螺桿液力透平作為一種容積式能量回收裝置,能完全應(yīng)對(duì)高水頭、小流量的運(yùn)行工況,且具有輸送介質(zhì)平穩(wěn)、壓力脈動(dòng)小、噪聲低、對(duì)工質(zhì)不敏感等優(yōu)點(diǎn)。本文以一種單吸雙螺桿泵反轉(zhuǎn)做透平為研究對(duì)象,利用結(jié)構(gòu)設(shè)計(jì)、理論分析、數(shù)值模擬、實(shí)驗(yàn)研究相結(jié)合的方法對(duì)雙螺桿液力透平的內(nèi)部流場(chǎng)、非定常動(dòng)力特性、回收效率等方面進(jìn)行了研究。本文的主要工作和創(chuàng)造性研究成果有:1.詳細(xì)總結(jié)了透平的國(guó)內(nèi)外研究現(xiàn)狀,指出了目前液力透平研究存在的問(wèn)題,提出了今后液力透平發(fā)展的趨勢(shì)和方向。結(jié)合雙螺桿液力透平的優(yōu)點(diǎn),介紹了在高水頭、小流量工況下可以達(dá)到的能量回收效果及產(chǎn)生的社會(huì)經(jīng)濟(jì)效益。2.對(duì)已有的螺桿轉(zhuǎn)子型線進(jìn)行對(duì)比分析,優(yōu)選出A型雙螺桿型線并加以研究。同時(shí)提出一種雙螺桿液力透平的基本結(jié)構(gòu),確定了主從螺桿的裝配以及傳動(dòng)方式,在此基礎(chǔ)上對(duì)雙螺桿液力透平外特性基本理論、能量回收機(jī)理、理論泄漏等進(jìn)行了分析說(shuō)明。3.首次利用CFD數(shù)值模擬完成了對(duì)雙螺桿液力透平內(nèi)部流場(chǎng)的研究,揭示了壓力場(chǎng)與速度場(chǎng)的分布規(guī)律,以及徑向力、軸向力、扭矩以及流量的旋轉(zhuǎn)周期特性。應(yīng)用CFD技術(shù)對(duì)不同進(jìn)口壓力、不同轉(zhuǎn)速下的雙螺桿液力透平的能量回收特性進(jìn)行了數(shù)值模擬分析,研究了流量、效率等外特性參數(shù)以及螺桿壓力分布、間隙泄漏流量受進(jìn)口壓力、轉(zhuǎn)速等因素影響的變化特征,得到了不同轉(zhuǎn)速下液力透平效率隨進(jìn)口壓力的變化規(guī)律。4.首次利用CFD數(shù)值模擬研究了螺桿結(jié)構(gòu)參數(shù)對(duì)透平回收效率、泄漏量、扭矩、軸向力以及徑向力的影響。具體包括螺桿導(dǎo)程(包絡(luò)角)對(duì)扭矩、受力、效率的影響,以及不同徑向間隙與不同中心軸距對(duì)雙螺桿液力透平的泄漏損失及效率的影響等;研究結(jié)果可為雙螺桿液力透平設(shè)計(jì)過(guò)程中對(duì)導(dǎo)程大小、徑向間隙大小、齒間間隙大小的確定提供參考。5.利用自主研發(fā)的高壓余能回收液力透平試驗(yàn)臺(tái)對(duì)雙螺桿液力透平樣機(jī)進(jìn)行了不同進(jìn)口壓力、不同轉(zhuǎn)速工況的實(shí)驗(yàn)研究,揭示了透平實(shí)驗(yàn)效率的變化特性;將實(shí)驗(yàn)數(shù)據(jù)與模擬結(jié)果相對(duì)比,分析兩者出現(xiàn)差異的可能性原因,并提出了進(jìn)一步提高透平回收效率的方法和途徑。6.統(tǒng)計(jì)數(shù)值模擬結(jié)果中不同監(jiān)測(cè)點(diǎn)的壓力數(shù)據(jù),對(duì)不同螺桿軸向位置的徑向間隙監(jiān)測(cè)點(diǎn)的壓力脈動(dòng)時(shí)域、頻域變化形成過(guò)程及變化特性進(jìn)行分析,結(jié)合具體時(shí)刻下的螺桿表面壓力分布指出了產(chǎn)生該變化特性的具體原因。
[Abstract]:Hydraulic turbine is an effective liquid kinetic energy and pressure energy recovery device recycling. In recent years, with the development of technology and the deepening of the hydraulic turbine, gradually applied in industrial processes. In general, different types of hydraulic turbine are their application areas, such as single the pump reversal turbine is only suitable for low head, high flow rate, for high head, small flow condition, there is not a mature technology of hydraulic turbine can be put into use in the long term, there is an urgent need to be solved. The research of double screw hydraulic turbine as a volume type energy recovery device, can fully respond to the operation condition of high head, small flow, and has a smooth conveying medium, the pressure fluctuation is small, low noise, the refrigerant is not sensitive. Taking a single suction double screw pump reverse penetration of flat Like, the structure design, theoretical analysis, numerical simulation, flow field experimental research method of combining the double screw hydraulic turbine, unsteady dynamic characteristics on recovery efficiency were studied. The main work and creative research results are: 1. a detailed summary of the research status of the turbine at home and abroad, pointed out. The existing hydraulic turbine research problems, puts forward the trend and direction of development of hydraulic turbine in the future. Combined with the advantages of double screw hydraulic turbine, introduced in the high head, comparative analysis of energy recovery effect can be achieved under small flow rate condition and the social and economic benefits of.2. on the screw rotor profile, select A twin screw type line and studied. At the same time put forward the basic structure of a double screw hydraulic turbine, the master-slave screw assembly and transmission mode, on the basis of the double screw hydraulic The basic theory and characteristics of turbine, energy recovery mechanism, the theory of leakage were analyzed by.3. for the first time CFD completed the numerical simulation study on the internal flow field of double screw hydraulic turbine, the distribution of pressure and velocity, axial and radial force, force, torque and the flow rate of the rotation cycle characteristics. The application of CFD the pressure of different technology import, energy recovery characteristics of double screw hydraulic turbine under different speed are analyzed through numerical simulation, studies the flow properties and the efficiency of external screw pressure distribution, leakage flow inlet pressure, speed change characteristics of influencing factors, the changing regularity of.4. hydraulic turbine efficiency with different speeds the inlet pressure for the first time using the CFD numerical simulation of structural parameters of the screw recovery efficiency of turbine, leakage, torque, axial force and radial force of the impact of specific. Including the lead screw (envelope angle) of torque, force, efficiency, and different radial clearance and different center wheelbase of the twin screw hydraulic turbine leakage loss and efficiency influence; the results can be used for the double screw hydraulic turbine design process of lead size, size to determine the size of the gap between teeth the gap size of reference.5. using self-developed high pressure energy recovery hydraulic turbine test rig under different inlet pressure of double screw hydraulic turbine prototype, experimental study on different speed conditions, reveals the variation characteristics of turbine efficiency experiment; experimental data and simulation results were compared, analysis of the two possible reasons of difference. And put forward the pressure data of different monitoring points further ways to improve the recovery efficiency of turbine.6. statistical numerical simulation results, the radial clearance of different screw axial position monitoring The pressure fluctuation in the time domain and frequency domain are analyzed, and the specific reasons for the variation characteristics are pointed out according to the specific pressure distribution at the specific time.

【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TK05

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